Musar for Rosh Hashanah 20:3
ואמר רב נחמן אמר רבה בר אבוה לדברי האומר ל' צריך ל' ושלשים לדברי האומר שלשה צריך שלשה ושלשים לדברי האומר ב' שבתות צריך שתי שבתות ושלשים יום וא"נ כר' יהודה ס"ל ג' ושלשים בעי
as we have learnt: 'It is not allowed to plant nor to bend over nor to graft in the year befor the Sabbatical year less than thirty days before New Year, and if one did plant or bend over or graft, he must uproot the plant. So R'Eleazar.
Shenei Luchot HaBerit
What all this has to do with Samael injuring the כף ירך יעקב, the thigh joint of Jacob, is simple. Our sages say on 32,26: וירא כי לא יוכל לו, ויגע בכף ירכו ותקע כך ירך יעקב, that the thigh joint of Jacob refers to the later descendants who experienced the harsh decrees by the various nations who were their hosts in exile. When the Hasmoneans overcame the Greeks, they reversed this injury, i.e. the כף became a פך a cruse of oil. What had been a vulnerable part of Jacob's ירך now became the solid basis of the candelabra, ירך מנורה.
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